JPH04149814A - Magnetic head - Google Patents

Abstract

PURPOSE:To attain a complete magnetic shielding against a core by adhering a thin film having high magnetic permeability at least on a part other than the sliding face of a magnetic recording medium on the surface of a slider. CONSTITUTION:In this magnetic head, the thin film 14 for shielding is adhered on the faces of the sliders 4, 5. The thin film 14 is made of 'Permalloy(R)', etc., which is a material with high magnetic permeability, and performs a magnetic shielding of the body 1 of the magnetic head. Also, the thin film 14 is adhered to and formed on the part other than the sliding faces 7, 8 on the surface of the sliders 4, 5. Then, on the face that is perpendicularly continuous to the sliding face 7, 8, the thin film 14 is not adhered but arranged so as not to come in contact with the magnetic disk. Thus, the recording and reproducing core 2 of the body 1, erasing core 3, and a coil winding bobbin are surrounded with the thin film 14 made of the material having high magnetic permeability, to be magnetically shielded.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a magnetic head that magnetically records or reproduces information by bringing a magnetic core into sliding contact with a magnetic recording medium, and particularly relates to a magnetic head that magnetically records or reproduces information by bringing a magnetic core into sliding contact with a magnetic recording medium. The present invention relates to a magnetic head having a slider made of a non-magnetic material that comes into sliding contact with a magnetic recording medium together with a magnetic core.

[Prior Art] This type of magnetic head is used, for example, in an FDD (floppy disk drive M) that records and reproduces information on both sides of a floppy disk, which is a flexible disk-shaped magnetic recording medium. A magnetic head called ``magnetic head'' is well known. The conventional structure of this magnetic head will be explained with reference to FIG. 9 and FIG. 1O.

The reference numeral 9 in FIG. 9 is an elastic plate made of stainless steel or copper alloy, which is fixed to the tip of a support member provided on a helad carriage (not shown). The magnetic head main body 1 is provided on this elastic plate 9.

Here, FIG. 9 shows a portion of the magnetic head main body 1 on the side of the magnetic recording medium sliding surface (hereinafter abbreviated as the sliding surface) that comes into sliding contact with a magnetic disk (not shown). Illustrations and descriptions of the opposite portion will be omitted.

The magnetic head body 1 includes a recording/reproducing core 2 formed in a thin plate shape.
The recording/reproducing core 2 has a magnetic gap 2a formed on the upper end surface facing the sliding surface, and a reinforcing plate 10.
It is held by 10.

Further, the reference numerals 3.3 and 3.3 respectively indicate erasing cores, which are similarly formed into thin plate shapes, with magnetic gaps 3a, 3a formed on their upper end faces facing the sliding surface, and reinforcing plates 11 and 3a formed between them. is held between the two. Erasing core 3.3 has an end face reinforced with plate 1
The recording/reproducing core 2 is provided in parallel with the end face of the O110.

The reinforcing plate 1O11O holding the recording/reproducing core 2 between them and the erasing core 3.3 holding the reinforcing plate 11 between them are held by a slider indicated by the reference numeral 4.5. The slider 4.5 is made of a non-magnetic material such as ceramics, and holds and reinforces both cores 2.3 on an elastic plate 9, and also comes into sliding contact with a floppy disk (not shown). This is for smoothing and stabilizing the sliding contact between the reinforcing plate 10.10 and the disk, and the reinforcing plate 10.10 and the erasing core 3.3 are sandwiched and fixed by adhesive.

The slider 4 on one side is formed in the shape of a rectangular thick plate, and the slider 5 on the other side is formed in the shape of a rectangular block with a larger width dimension than the slider 4. A groove 6 is formed parallel to the core 2.3. The upper surfaces of both cores 2.3 and the slider 4 in the figure and the portion of the upper surface of the slider 5 on the side of the core 2.3 from the groove 6 are flush with each other and are formed as a first sliding surface 7, and the upper surface of the slider 4 groove 6
A portion on the opposite side of the core 2.3 is formed as a second sliding surface 8.

A pair of magnetic heads configured in this way are provided in the FDD, and as shown in FIG. 10, the magnetic heads shown by the symbol l in FIG. The magnetic head main body 1' is the same as that shown in FIG. 9, and on the opposite side with the magnetic disk 12 in between, a magnetic head main body 1' having exactly the same structure as the magnetic head main body 1' is arranged on an elastic plate 9'. The magnetic head body 1' is the magnetic head body 1
It has the same structure as , but the reference numerals of each part in the figure are distinguished by a dash.

As shown in the figure, the recording head main body 1.1' has a recording/reproducing core 2.2° and an erasing core disposed at positions shifted in the radial direction of the magnetic disk 12 from the respective centers, and both sides of the magnetic disk 12 The structure is such that a track width of A is secured.

As the magnetic disk 12 is rotationally driven,
Each recording/reproducing core 2. of the magnetic head body 1.1'.
2' and the erase core slide into contact with tracks at different positions on the upper and lower surfaces of the magnetic disk 12, and information is recorded and reproduced.

By the way, in the conventional magnetic head for FDD as described above, in order to shield the magnetic head main body from external magnetic noise, the magnetic head main body 1 is installed as shown in FIG.
A structure is adopted in which the entire area is surrounded by a rectangular cylindrical shielding plate 13 made of a material with high magnetic permeability. This shielding plate 13 is fixed to the elastic plate 9 by adhesive or the like.

[Problem to be solved by the invention] However, if the structure shown in FIG. 11 is adopted, the shielding plate 1
There is a drawback that the shielding plate 13 may fall off from the elastic plate 9 due to age-related changes in the adhesive used to fix the shielding plate 3 or vibrations during driving of the FDD.

Further, since it is necessary to provide a clearance with the slider 4.5, a slight gap inevitably occurs between the shielding plate 13 and the slider 4.5. Furthermore, depending on how the shielding plate 13 is attached, a slight gap may be created between it and the elastic plate 9.

For this reason, there is also a drawback that the magnetic shielding for the core, which is the original purpose of the shielding plate 13, is often incomplete.

Therefore, an object of the present invention is to provide a magnetic head of this type.
It is an object of the present invention to eliminate the above-mentioned drawbacks of the conventional art and to ensure good magnetic shielding or electromagnetic shielding of a magnetic head.

[Means for Solving the Invention] In order to solve the above problems, the present invention provides a magnetic head having a slider made of a non-magnetic material that sandwiches a magnetic core and makes sliding contact with the magnetic recording medium together with the magnetic core. A structure in which a thin film made of a high magnetic permeability material or a thin film made of a high conductivity material is deposited on at least a part of the surface of the slider other than the sliding surface of the magnetic recording medium. Alternatively, a structure in which a thin film made of a high magnetic permeability material and a thin film made of a high conductivity material are laminated and deposited is adopted.

[Function] According to the structure in which a thin film made of the above-mentioned high magnetic permeability material is deposited, magnetic shielding can be performed by the thin film. Further, according to a structure in which a thin film made of a highly conductive material is deposited, electromagnetic shielding or electrostatic shielding can be performed by the thin film. Further, according to a structure in which a thin film made of a high magnetic permeability material and a thin film made of a high conductivity material are laminated and deposited, both magnetic shielding and electromagnetic shielding or electrostatic shielding can be performed.

[Example] Hereinafter, details of embodiments of the present invention will be described with reference to the drawings.

Here, the magnetic head of the above-mentioned FDD catamaran quive is taken as an example, and in the drawings of the example, parts common or equivalent to those in the conventional example in FIGS. 9 to 11 are given the same reference numerals. Yes, the explanation will be omitted.

First, FIGS. 1 and 2 are a perspective view and a schematic side sectional view in a recording/reproducing state of a magnetic head according to an embodiment of the present invention, illustrating the structure related to the present invention.

As shown in both figures, the magnetic head of this embodiment does not have the shielding plate 13 of the conventional example shown in FIG. 11, but instead has a shielding thin film 14 adhered to the surface of the slider 4.5. ing. This thin film 14 is for magnetically shielding the magnetic head body 1, or for electromagnetic shielding or electrostatic shielding. If magnetic shielding is to be performed, it is made of a high permeability material such as permalloy, centast, or ferrite. When performing electromagnetic shielding or electrostatic shielding, it is made of a highly conductive material such as copper, aluminum, or silver, and is deposited and formed by a thin film forming technique such as sputtering.

The thin film 14 also covers the shaded areas other than the sliding surface 7.8 on the surface of the slider 4.5, that is, the four outer surfaces and the grooves 6.
A film is formed on the inner surface of the elastic plate 9 and the surface in contact with the elastic plate 9. As shown in FIG. 2, in order to prevent the thin film 14 from coming into contact with the magnetic disk 12 of the recording medium, the slider 4.5 has a sliding surface that is perpendicular to the sliding surface 7.8 on the surface of the slider 4.5. It is assumed that the thin film 14 is not applied to a portion of about 0.3 mm from the surface 7.8. Also, here, a notch is formed in the slider 4.5 to provide a space for accommodating the winding bobbin 15 fitted to the recording/reproducing core 2 and the winding bobbin (not shown) fitted to the erasing core 3.3. Notch 4
The thin film 14 is not deposited on the inner surfaces of a and 5a.

The structure of the magnetic head of this embodiment other than the above-mentioned parts is the same as that of the conventional example described above.

According to the structure of the magnetic head of this embodiment, the recording/reproducing core 2, the erasing core 3.3i5, and the winding bobbin of the magnetic head main body 1 are surrounded by the thin film 14.
If the thin film 14 is made of a material with high magnetic permeability, magnetic shielding can be performed, and if the thin film 14 is made of a material with high conductivity, electromagnetic shielding or electrostatic shielding can be performed. Noise or electrostatic noise can be blocked, and recording and reproduction can be performed satisfactorily.

Moreover, the thin film 14 attached to the sliders 4, 5 does not have the problem of falling off like the shielding plate 13 in the conventional example shown in FIG. There is no problem of shield failure, shielding can be reliably performed well, and the recording/reproducing characteristics and reliability of the magnetic head can be improved. Furthermore, since the shielding plate 13 is not attached, the assembly process of the magnetic head is also simplified.

By the way, the slider 4 to which the thin film 14 for shielding is applied.
The surface area of 5 is not limited to the area shown in FIGS. 1 and 2, but other embodiments in which the attachment area is different are shown in FIGS. 3 to 8.

In the embodiment shown in FIG. 3, the thin film 14 is formed only on both sides of the surface of the slider 4.5 along the medium sliding direction indicated by arrow A.
It is covered with In addition, in the embodiment shown in FIG. 4, the slider 5
The thin film 14 is coated only on the bottom surface of the groove 6.

Even if the area to which the thin film 14 is applied is limited in this manner, as long as the area to which the thin film 14 is applied is an effective area for shielding, shielding can be achieved satisfactorily.

Further, in the embodiment shown in FIG. 5, a thin film 14a made of a high magnetic permeability material is deposited on the surface of the slider 4.5, and a thin film 14b made of a high conductivity material is further laminated and deposited. . In this way, both magnetic shielding and electromagnetic shielding or electrostatic shielding can be performed.

Next, in the embodiment shown in FIG. 6, the shape of the slider 4.5 is different, and steps are formed on the four outer surfaces, and the portions other than the vicinity of the sliding surface 7.8 are formed as recesses 4b, 5b. A thin film 14 is deposited on the surfaces of the recesses 4b and 5b,
This structure, which does not cover the portions closer to the sliding surface 7.8 than the recesses 4b and 5b, has the advantage that it is easy to define the position of the lower edge of the thin film 14 in the figure.

Next, in the embodiment of FIG. 7, the slider 4.
A thin film 14 is also adhered to the inner surfaces of the notches 4a and 5a formed in the groove 5. This will improve the shielding effect.

Further, in the embodiment shown in FIG. 8, a part 4c of the slider 4.5 is divided into a part of the side part parallel to each groove 6.
, 5c are fixed to the slider 4.5, and a thin film 14 is adhered to both sides of parts 4c and 5C. In this way, the thin film 14 becomes two layers, and the shielding effect can be improved.

As described above, the parts to which the thin film 14 is applied can be prepared in various ways, and the degree of freedom in selecting the part to be shielded is greater than in the case of using the conventional shielding plate 13. can.

[Effects of the Invention] As is clear from the above description, according to the present invention, in a magnetic head having a slider made of a non-magnetic material that sandwiches a magnetic core and makes sliding contact with a magnetic recording medium together with the magnetic core, A structure in which a thin film made of a high magnetic permeability material or a thin film made of a highly conductive material is deposited on at least part of the surface of the slider other than the sliding surface of the magnetic recording medium, or Since we have adopted a structure in which a thin film made of a magnetically permeable material and a thin film made of a highly conductive material are laminated and deposited, the thin film can provide magnetic shielding, electromagnetic shielding, or electrostatic shielding. There are no problems such as falling off or poor shielding when using a shielding plate, and the shielding can be reliably performed well, improving the recording/reproducing characteristics and reliability of the magnetic head, as well as simplifying the assembly process of the magnetic head. You can get the same effect.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing the structure of a magnetic head according to an embodiment of the present invention, FIG. 2 is a schematic side sectional view of the same magnetic head in a recording/reproducing state, and FIGS. 3 and 4 are different from each other. A perspective view of a magnetic head according to an embodiment, FIGS. 5 to 8 are schematic side sectional views of magnetic heads according to different embodiments, and FIG. 9 is a perspective view showing the structure of a conventional magnetic head.
FIG. 10 is a schematic side sectional view of the same magnetic head in a recording/reproducing state, and FIG. 11 is a perspective view of another conventional magnetic head. 1--Magnetic head body 2-Recording/reproducing core 3--Erasing core 4.5--Slider 7.8--Medium sliding surface 9--Elastic plate 1O11! -・Reinforcement plate 12-Magnetic disk 14.14a, 14b-Thin film stripes for shielding, too! Il Liaoguan Leopard Distribution Figure 7

Claims (1)

[Scope of Claims] 1) In a magnetic head having a slider made of a non-magnetic material that sandwiches a magnetic core and makes sliding contact with the magnetic recording medium together with the magnetic core, the surface of the slider has a surface other than the sliding surface of the magnetic recording medium. A magnetic head characterized in that a thin film made of a high magnetic permeability material is coated on at least a part of the part. 2) In a magnetic head having a slider made of a non-magnetic material that sandwiches a magnetic core and makes sliding contact with the magnetic recording medium together with the magnetic core, at least a portion of the surface of the slider other than the sliding surface of the magnetic recording medium is A magnetic head characterized by being coated with a thin film made of a highly conductive material. 3) In a magnetic head having a slider made of a non-magnetic material that sandwiches a magnetic core and makes sliding contact with the magnetic recording medium together with the magnetic core, at least a portion of the surface of the slider other than the sliding surface of the magnetic recording medium is A magnetic head characterized in that a thin film made of a high magnetic permeability material and a thin film made of a high conductivity material are laminated and deposited.